Everything is stored on ipad meaning I don't need a constant Internet connection unlike some war gaming apps I've used previously. But I would argue its best feature is the section interface allowing me to find exactly the section I want easily. Although it took a little getting used to. Slight flaw is lack of other osprey products, so far only rise of Rome has been covered, and with no updates for a year it looks bleak. Still this save me quiet a bit compared to hard copy rules and is a welcome edition to my gaming tools.